Belt tightener for power units



June- 24, 1930.

A. E. NIELSEN BI'JL'I TIGHTENER FOR POWER UNITS 2 Sheets-Sheet 1 Filedon. 10, 1927 I E amnwtoz aflzfawflfielselz June 24, 1930. A. E; NIELSEN1,757,010

BELT TIGHTENER FOR POWER UNITS Filed Oct. 10, 192'! 2 sheets-sheet 2Patented June 24,1930 7 1 1 757 010v UNEEEEID srnrssraremr OFFICE ANTONE. NIELSEN, or BRooKnYN, NEW YORK BELT TIGHTENER FOR POWER'UNITSApplication filed October 10, 1927. Serial No. 225,074.

This invention relates to power transmisas substantially horizontal,drawn to a dision devices, with special reference to belt minishedscale. drives between two parallel shafts, and more Figure 5 is asimilar View of the same with particularly to devices for maintaining adethe b lts directed obliquely. 1 i bl b lt ten ion; Describing thedrawings in greater detail, 55

Due to the ever widening use of electricity, the llllmeml 10 deslgnatesgeneral a its flexibility, convenience,accessibility and h n Y levelPlatform mlsedbase P Q dependability, amultitude of motors are em- Vldd.h apertured lugs 11 by which 1t ployed as drivers for mechanisms ofwidely m y be Seemed in y desired adjusted P l,

Such motors operate, attheir best, at a h e of t platform 13 a e speedfar in excess of the usual requirements tlonal electnc motor 1 held 111Posltlon by for the majority of machines, entailing the a bracket and hl a Shaft h t interposition of speed reducing means outer portlon ofwhich is fixed a spur pinion tween the motor shaft and driving belt pulley shaft, as it is not regarded as good prao- Meshmg Wlth the Plhloh 1Sa gear. 16 fixed tice to run a belt beyond a certain lineal o a shaftParallel with axls f the speed rate per minute determined by the m hrhvohlbly mounted m palrzof Character of the belt plllow blocks 18bolted: to the frontportion It further occurs that the direction of theof gf h f g i 70 belt, as vertical, horizontal or oblique, must pre h 5P S an ec Oget be considered and, as the diameter of the h ham 1 drivingpulley is usually relatively small as Tfi fig i i d b I b compared withthe driven pulley, it is de- 3 ion a e m rags sirable to wrap the beltaround the driver as 353 2:: 353;; l i 2 252352 33 75 much Posslble 1nordhr h prolllde chambers as at 22, and extend out beyond quatefrictional contact with its perlphery to the blocks at both ends as Seenn F1 prophrly tmhshht the h, V Freely mounted on the extending ends of talso desll'able h provlcte powerhhlt the brasses is a frame 23 overlyinthe top 80 unlversally ava1lable lrrespective of position of the pillowblock and havin atbits Outer and having belt tighheher adjustable fronted e a raised arcuate flang e 24. I chhtncahy Wlth the dnvlhg pulley andon Also i otatably mounted on the outer end 7 elt'her slde of the beltofthe brass 21 is a plate 25 generally cir- These eeveml advantage/Quefeatures: cular', and having an extending arm 26 con- 85 gether Wlthother? Whleh W111 become P taining aslot 27, the plate having a circularP as the desel'lptlen phogressesa are row of equallyspaced threadedopenings 28 eempllehed y the novel, Simple and F to receive screws 29passing through the 131C211. construction and arrangement of parts,flange 24 t i idly Secure th plate 251 hereinafter clearly descrlbed andshown in frame 23 i j ta iti b t Permitting 90 the accompanylng flmw gml g i the plate and its arm to be adjusted angularly terial part ofth1s disclosure, and in wh1ch: ith f r n t th frame F g 1 e P P e Viewof a Power A 111g, 30, integral with the top of the 1111115: lnehldlng abelt g made 111 3 frame 23, is bored'to receive a spindle 31, disrdancewith the invention. posed at a right angle to the axis of the shaft 95Figure 2 1s a side elevational view of the 17 a d h ld i dj t t b a tScrew 32 same looking from the pulley side. threaded into the top of thelug 30, this spin- Figure 3 is an enlarged fragmentary secdle adjustablycarrying a weight block'33. tional view taken on line 3-3 of Figure 2.Fixed on the outer end of the shaft 17 is Figure 4 is an end viewshowing the drive a drive pulley 34 around which is trained 100 varianttypes and purposes. tlena driving belt leading to a driven pulley on themechanism to be actuated by the motor.

In order to keep this belt in a properly taut condition, the upper runis passed under an idle pulley 36 revolubly mounted on a spindle passedthrough the slot 27 in-the arm 25 and held adjustably by a clamp nut 37.

From the foregoing it will be seen that the space between theperipheries of the pulleys 34 and 36 may be varied to suit requirements;that the idler 36 may be adjusted around the driver at any desired angleto the driving pulley concentric therewith, by means-of the screws 29,and that the counterweight 33 may be adjusted to give any requiredtensionto the belt, or even reversed in position from front to rear asseen in Figures 4 and 5.

As changes of construction could be made within the scope of theinvention, it is intended that all matter contained in the foregoingdescription or siiOYi'il in the accompanying drawings shall beinterpreted as illus-- trativeand not in a limiting sense, I

Having thus described my invention, what I claim as new and desire tosecure by Lett ers Patent, is i 1. A belt tightener comprising incombination with a bearing, a drive shaft and pul-' ley, of a framejournalled on said shaft to straddle the bearing whereby its rotativemovement is limited, ar'adial arm mounted on said shaft intermediate thepulley and frame, said arm having spaced perforations disposed inacircle to receive bolts from said frame whereby it may be adjusted atany radial angular position, a counterweight for said arm adjustablycarried by said frame, and an idle pulley carried by said arm adjustable with respect to the first named pul- 18y.

2. A belt tightener comprising in combination with a bearing, a driveshaft and pulley, of a frame j ournalled on said shaft to straddle thebearing whereby its rotative movement is limited, a radial arm mountedon said shaft intermediate the pulley and frame, means for clamping saidarm to said frame at any adjusted position within a complete circle, anidle pulley carried by said arm, means for adjusting the distancebetween the axes of said pulleys, and adjustable means for exertingpressure in either direction on said idle pulley.

3. A belt tightener comprising in combination with a drive shaft, apulley thereon and a bearing for the shaft, of a frame oscillatable onthe bearing, a flange on the frame, a plate rotatable on the bearing, anarm on said plate, means to adjustably secure said plate to the flangewhereby the arm may be held at any radial angle and oscillate with theframe, a stud in said arm adjustable parallel to said shaft, van idlerrevoluble on the stud in register with said pulley, and adjustto receivebolts from said flange and provided with a radial arm having a slot, astud adjustable in the slot, and an idler on the stud in register withsaid pulley, said idler being operative with respect to a belt trainedoversaid pulley irrespective of its direction.

51 A belt tightener comprising in c'ombina tion with'a drive shaft, abearing therefor and a pulley on said shaft adjacent the hearing, of aframe mounted to oscillate on the extending ends of said bearing, aplate pivoted intermediate said frame and p'ull'ey, said plate having aslotted arm, a stud adj ustably held in the slot of said arm, an idlerrotatable on said stud in register with said drive pulley, means forrigidly securing said plate and frame in relative angular adjustment,

and acounterweight adjustably carried by said frame. w In testimonywhereof I affix my signature. r r

V ANTON E. NIELSEN.

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